This story partially addresses your question. It doesn't have enough details. http://www.npr.org/2016/07/03/484259562/star-trackers-help-juno-find-its-way htt

This story partially addresses your question. It doesn't have enough details. http://www.npr.org/2016/07/03/484259562/star-trackers-help-juno-find-its-way http://www.npr.org/2016/07/03/484259562/star-trackers-help-j...